Inside mold part for cast concrete



J. E. ROBERTO INSIDE MOLD PART FOR CAST CONCRETE March 1, 1960 Filed Jan. 11, 1955 2 Sheets-Sheet 1 \ONi INVENTOR March 1, 1960 J. E. ROBE-RTO 2,926,413

INSIDE MOLD PART FOR CAST CONCRETE Filed Jan. 11, 1955 2 Sheets-Sheet 2 United rates Patent 2,926,413 INSIDE MOLD PART F CAST CONCRETE Joseph E. Roberto, Fairfield, Conn. Application January 11, 1955, Serial No. 481,188

- Claims. c1. 25-118) This invention relates to molds or forms for use in making cast concrete shapes, and more particularly to inside mold parts, as for forming cast concrete tops or collars of catch basins and drop inlets of the type used in street and sewer construction.

While the invention is illustrated and described herein in connection with such cast concrete tops of catch basins and drop inlets, it should be understood that the invention is not limited wholly to the specific embodiments disclosed; the scope instead is defined in the appended claims.

An object of the invention is to provide an improved, multi-part form adapted to constitute an inside mold part, as for use in forming cast concrete tops of catch basins and the like, which form may be used over and over again, may be quickly and easily set up, and after the concrete has been cast, may be readily dismantled and stripped from the concrete, thus effecting a considerable saving in time and labor, and construction costs. Another object of the invention is to provide an improved multi-part form as above set forth, which is simple and economical to fabricate, and easy to understand and operate.

A further object of the invention is to provide an improved multi-part form in accordance with the above, which is strong and sturdy while at the same time being light in weight, and reliable in use.

Still another object of the invention is to provide an improved multi-part form as above outlined, which requires but little space when dismantled and transported or stored away. I

A feature of the invention resides in the provision of an improved multi-part form as above characterized, which may be made virtually entirely of ordinary construction materials such as wood, angle iron, nuts and bolts, etc. r

Another feature of the invention resides in'the provision of a multi-part form of the type described, wherein certain parts while permanently joined to each other, are articulated to facilitate the stripping thereof, thus reducing the number of individual or separate components making-up the form. I H

Other features and advantages will hereinafter appear.

In the accompanying drawings;

Figure 1 is a vertical sectional'view of a concrete or cement drop inlet having the multi-part form ,of the present .invention in place inside of the top portion of the inlet, priorto the form being stripped.

Fig. 2 i's'a 'verticalsection of a cement orconcrete c atch basin, having the multi-part form of the invention disposed within'its'topportion'prior to the form being stripped.

..F.- s- .35i anexp odednndismant ie of them l part form of the invention.

Fig. 4 is a top or plan view of the mu'lti-part form, completely assembled.

Fig. 5 is a vertical section taken on line 5--5 of Fig. 4.

Fig. 6 is a fragmentary perspective view of a lower 2,925,413 Patented Mar. 1, 1960 BQQ The drop inlet of Fig. 1 has a concrete top or collar I 15 which is formed preferably after the fabrication of the bottom and side walls of the inlet, using the improved multi-part form 16 of the present invention.

In Fig. 2 a catch basin is illustrated, having front and rear walls 20 and 21, side walls 22 and a bottom wall 23. Carried by the rear wall 21 is an outlet pipe 24, to provide for egress of water from the basin. The catch basin has a cement or concrete collar or top 25 which is formed after the fabrication of the walls 20, 21, 22 and 23, by the use of the improved multi-part form 16 of this invention.

Referring to Fig. 3, the present improved multi-part form 16 comprises a front section 26 which is in the form of a U-shaped member, constructed for example of wood, having three elongate, horizontally-extending plates 27, 28 and 29 which are set on edge and joined at their ends. The plates 27, 28 and 29 may be advantageously secured to each other by nails or screws, and the joints reinforced by the provision of vertical blocks 30 placed in the corners.

Referring to Fig. 4 the multi-part form 16 includes a pair of angle members 31 and 32, the angle member 31 having a rear plate 33 and a side plate 34, and the angle member 32 having a rear plate 35 and a side plate 36. The plates of the angle members 31 and 32 may also be advantageously formed of pieces of wood. The angle members 31 and 32 are set on edge and disposed so that together they form a U, the adjacent ends 37 and 38 of the members being joined to each other and the remote ends 39 and 40 of the members being joined respectively to the ends 41 and 42 of the U-shaped member 26.

By this arrangement there is provided an open box-like form. The joined ends 39, 41 and 40, 42 of the U-shaped member 26 and the angle members 31 and 32 are separably joined together, and I have shown one simple and convenient structure for accomplishing this. This structure comprises wooden blocks 43 having nails 44 which are only partially driven into the blocks 43. The nails 44 are driven into but not through the side plates 28, 29, 34 and 36 of the form, allowing the head portions of the nails to project. Thus when it is desired to dismantle the form, a hammer or nail puller may be employed to easily and quickly remove the blocks 43, whereupon the side plates 28, 29, 34 and 36 may be readily separated.

Referring to Figs. 3 and 5, the angle members 31 and 32 are separably attached to each other by transverselyslotted girders or rigid bars in the form of angle irons 45 and 46 which are secured to the plates 33 and 35 by means of bolts passing through the slots and having wing nuts. Thus by loosening the wing nuts, the angle irons 45 and 46 may be readily removed, whereupon the plates 33 and 35 of the anglemembers will hereleased from each other. i

The multi-part form of this invention further comprises upward, tapered extensions 47 and48 on the oppositely disposed side plates .34 and 36 respectively, said extensions projecting above the remaining plates 28, 29,

33,. and 35 .oftheiformgl provide. .a ,pair. ofhood;

in Fig. 5 wherein they rest on the upper inclined edges 53 and 54 of the extensions .47 and 48 respectively. By the provision of the hinges 52 the hood members 50 and 51 may be aligned with the back plates 33 and 35 during the process of stripping the form from the completed cement work, and such alignment enables the stripping to be facilitated. v

The hood members 50 and 51 are attached to each other and reinforced by a girder means comprising a transversely-slotted angle iron 55 which extends inside and along the length of the members and is secured thereto by bolts having wing nuts. The girder means 55 may thus be readily separated from the hood members, yet when it is in position it will stoutly support said members and enable them to carry an appreciable load.

The back plates 33 and 35 are separably connected to the side plates 34 and 36 of the angle members by angle brackets 60 which are permanently fastened to the back plates 33 and 35 by pivot bolts 61. The angle brackets 60 have upper and lower slots 62 and 63 accommodating bolts having wing nuts by which the brackets may be rigidly attached to the associated plates. Loosening of the wing nuts will permit the angle brackets 60 to be swung upward about the pivots 61, as shown in Fig. 3, thereby to enable the side plates 34, 36 to be separated from the back plates 33, 35. I

It will be understood from the above description that the various components of my improved multi-part form may be readily and quickly secured to each other, to set up the form for use, and also that the components may beseparated or detached from each other in order to enable'the form to be stripped from the cement work.

Referring to Figs. 1 and 2 it will be seen that the form 16 may be positioned in the upper portion of a drop inlet or catch basin, whereupon the cement collars and may be cast about the form. When the collars or tops have hardened and set, the form 16 may be readily stripped therefrom by loosening and removing the various separable connector means. The side plates 34 and 36 may first be removed and stripped, then the rear plates 33 and with the attached hoods 50 and 51, and thereafter the front U-shaped member 26 may be stripped.

Preferably, to facilitate the stripping, the corners of the U-shaped member 26 may have an angle slightly more than 90 degrees, the same being done also at the corners of the angle members 31 and 32, whereby the Width of the form measured at the edges 41 and 42 joined by the blocks 43 is greater than the length of the yoke of the U-shaped member, and also greater than the width of the form where the angle members 31 and 32 are combined. That is,-the width ofthe form is greater at a point between its ends, than at the ends 27 and 33, 35. This enables the plates 33 and 35, and the member 26 to be more easily stripped and removed.

The form 16 after stripping may be easily and quickly set up again for use, and may be used many times before it has to be eventually discarded.

Variations and modifications may be made Within'the scope of the claims and portions of the improvements may be used without others. 7

I claim:

1. A multi-part form capable of being dismantled and adapted when set up to constitute an inside mold part around which concrete may be cast for forming the concrete top of a catch basin or drop inlet, comprising a unitary U-shaped structure constituting the front and frontal portions only of the sides of the mold part, said structure being formed of three elongate, horizontallyextending generally flat plates comprising a front plate and two side plates set on edge and non-detachably joined toeach other at adjoining vertical edges so as to be normally inseparable; a pair of angle structures, together constituting the rear and the rear portions of the sides of the mold part, each angle structure being formed of a side plate and a rear plate set on edge and means separably joining the plates to each other along adjacent vertical edges, said angle structures being detachably connected to each other along adjacent vertical edges of the rear plates to form a dismantleable U and the ends of the side plates of said angle structures being detachably connected to the ends of the U-shaped structure to form an open, rectangular dismantleable form, the two side plates of the angle structures having upward, tapered extensions projecting above the remaining rear plates of the angle structures; a pair of aligned, rear hood members extending from the upper edges of the rear plates of the angle structures in directions angularly upward and inward of said rectangular form and abutting rear edges of said tapered extensions for support thereby; means permanently movably attaching each of the hood members to said remaining rear plates; and rigid elongate bracing means removably secured to and disposed against the inside surfaces of said hood members, to rigidly interconnect the same, said means being coextensive with the hood members.

2. The invention as defined in claim 1 in which the bracing means comprises a girder means removably securing together the hood members, and in which there are girders removably securing together the said rear plates of the angle structures, all of said girders being detachable to separate the angle structures from each other.

3. The invention as defined in claim 2 in which the means separably joining together the side and rear plates of each of the angle structures comprise pivoted angle brackets enabling the plates of said structures to be separated to facilitate the stripping thereof.

4. The invention as defined in claim 1 in which there are separable rigid bars detachably connecting the rear plates of the angle structures to each other and maintaining the rear plates aligned, said separable bars enabling the said structures to be dismantled for stripping the form from the cast concrete.

5. The invention as defined in claim 3 in which each of the angle brackets joining the side and rear plates of the angle structure is pivotally secured to one plate thereof and has a slot for receiving a fastener carried by the other plate of the angle structure.

References Cited in the file of this patent UNITED STATES PATENTS 934,477 Thinnes Sept. 21, 1909 972,015 Miller Oct. 4, 1910 1,151,631 Walker Aug. 31, 1915 1,254,919 Marqua et al. Jan. 29, 1918 1,258,923 Marqua et al. Mar. 12, 1918 1,560,494 Trester Nov. 3, 1925 1,598,665 Urban Sept. 7, 1926 1,675,749 Crawford July 3, 1928 1,892,311 MacDonald Dec. 27, 1932 1,926,633 Scott Sept. 12, 1933 2,507,061 Symons May 9, 1950 2,586,413 Antonello Feb. 19, 1952 2,610,381 Rosati et al. Sept. 16, 1952 2,650,410 Mitchell Sept. 1, 1953 FOREIGN PATENTS 421,500 Italy May 26, 1947 

